The paper is suggesting that L283 may have been introduced to Sardinia during the Bronze Age by migrants from other Mediterranean zones such as mainland Italy or the Balkans, based on material evidence that shows contact between Sardinia and these zones. However, the sample is lacking in Steppe admixture and so it could be that these migrants had little genetic impact originally, that is if L283 can be linked to IE speakers in this case. I think it's likely that this sample belonged to a pre-Z615 branch of J-Z600.

3 additional samples with J2b-L283 came out today. All three in Sardinia around the same timeframe as the sardinian aDNA sample from yesterday.

Chronologically they fit well with the arrival of the sea peoples called "Sherden" to Sardinia. Sherdens have already long ago been hypothesized to originate from Illyrians.

The sherden wore kilts like albanians, and there are actually some words in paleo-sardinian which can be linked to albanian language.The fact that a lot of these words, which are shared between albanian and sardinian, are actually related to ship-building(words like yew and wood) and navigation at sea(words like stream and stony peak), furthers strengthens this view.

But we should nevertheless be cautious not do draw conclusions just yet, because in the next few weeks we are probably going to see lots of new aDNA papers, which potentially could turn everything upside down. More samples from Italy and western balkans will surely clarify when and from where J2b-L283 got to sardinia.

3 additional samples with J2b-L283 came out today. All three in Sardinia around the same timeframe as the sardinian aDNA sample from yesterday.

Chronologically they fit well with the arrival of the sea peoples called "Sherden" to Sardinia. Sherdens have already long ago been hypothesized to originate from Illyrians.

The sherden wore kilts like albanians, and there are actually some words in paleo-sardinian which can be linked to albanian language.The fact that a lot of these words, which are shared between albanian and sardinian, are actually related to ship-building(words like yew and wood) and navigation at sea(words like stream and stony peak), furthers strengthens this view.

But we should nevertheless be cautious not do draw conclusions just yet, because in the next few weeks we are probably going to see lots of new aDNA papers, which potentially could turn everything upside down. More samples from Italy and western balkans will surely clarify when and from where J2b-L283 got to sardinia.

Interesting observation!

All four J2b-L283 samples come from the LBA Nuragic period. This haplogroup was not found anywhere in Sardinia prior to this period, and we know it was found earlier in BA Croatia and BA North Caucasus. Besides J2b-L283, we should keep in mind that we have a R1b-BY611* and some E-V13's, R1b-PF7563's in Sardinia, which would fit this timeframe given the TMRCA's. Nevertheless, I agree that we shouldn't jump to any conclusions just yet, but here is the interesting hypothesis that you mentioned in regards to Paleo-Sardinian languages:

According to Alberto Areddu[8] the Sherden were of Illyrian origin, on the basis of some lexical elements, unanimously acknowledged as belonging to the indigenous substrate. Areddu asserts that in ancient Sardinia, especially in the most interior area (Barbagia and Ogliastra), the locals supposedly spoke a particular branch of Indo-European. There are in fact some correspondences, both formal and semantic, with the few testimonies of Illyrian (or Thracian) languages, and above all with their theorized linguistic continuation, Albanian. The correlations include various central toponyms and microtoponyms; for instance Areddu offers the following correlations:

All four J2b-L283 samples come from the LBA Nuragic period. This haplogroup was not found anywhere in Sardinia prior to this period, and we know it was found earlier in BA Croatia and BA North Caucasus. Besides J2b-L283, we should keep in mind that we have a R1b-BY611* and some E-V13's, R1b-PF7563's in Sardinia, which would fit this timeframe given the TMRCA's. Nevertheless, I agree that we shouldn't jump to any conclusions just yet, but here is the interesting hypothesis that you mentioned in regards to Paleo-Sardinian languages:

Very interesting how we also have BY611, V13 and PF7563 there too, i had not noticed that. Maybe those HG's will show up in Sardinian aDNA of the same period when more samples are tested there.

I also noticed that the Nuragic era sardinians had mtDNA which was also present in Srubnaya and Scythians, which means that the steppe ancestry brought by J2b-L283 probably was just diluted by time, just like the samples with steppe mtDNA didn't show steppe ancestry due to dilution.